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Schubart region HS.821

From Hristov, Hristova & Tanikawa (2026)

Schubart region HS.821 is a periodic orbit of the planar three-body problem: three equal masses that return to their starting positions and velocities every 331.45 time units, published by Hristov, Hristova & Tanikawa (2026). Stable orbits that pass extremely close to a binary collision, descended from Schubart’s rectilinear orbit. They needed 100-digit arithmetic to find. It is linearly stable (largest Floquet multiplier 1.000), so a small nudge only makes it wobble. The bodies pass within 0.0000583 of each other at a top speed of 131, line up 504 times a period, and the computed loop closes to 2.3×10⁻²³.

Measured over one period

Period: 331.4530285
Masses: 1 : 1 : 1
Energy: -1.70593
Angular momentum: 0
Closest approach: 5.8×10⁻⁵
Top speed: 131.0
Path length: 866.67
Alignments per period: 504
Topology: ababABAbabABAbabaBABabaBABababABAbabABAbabaBABabaBABababABAbabABAbabaBABabaBABabaBABAbabABAbabABABabaBABabaBABAbabABAbabABABabaBABabaBABAbabABAbabABAbabaBABabaBABababABAbabABAbabaBABabaBABababABAbabABAbabaBABabaBABababABAbabABAbabABABabaBABabaBABAbabABAbabABABabaBABabaBABAbabABAbabABABabaBABabaBAB (free-group class)
Stability: stable (|λ|max 1.000, published)
Loop closure: 2.3×10⁻²³

Neighbours on the map

All Schubart region, the families of periodic three-body orbits, or the atlas map.